diff --git a/[refs] b/[refs]
index 1e1c25eb36d6..e5a8ba2b213f 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 429966b8f644dda2afddb4f834a944e9b46a7645
+refs/heads/master: 83d349f35e1ae72268c5104dbf9ab2ae635425d4
diff --git a/trunk/arch/x86/kernel/apic/ipi.c b/trunk/arch/x86/kernel/apic/ipi.c
index dbf5445727a9..6ef00ba4c886 100644
--- a/trunk/arch/x86/kernel/apic/ipi.c
+++ b/trunk/arch/x86/kernel/apic/ipi.c
@@ -106,6 +106,9 @@ void default_send_IPI_mask_logical(const struct cpumask *cpumask, int vector)
 	unsigned long mask = cpumask_bits(cpumask)[0];
 	unsigned long flags;
 
+	if (WARN_ONCE(!mask, "empty IPI mask"))
+		return;
+
 	local_irq_save(flags);
 	WARN_ON(mask & ~cpumask_bits(cpu_online_mask)[0]);
 	__default_send_IPI_dest_field(mask, vector, apic->dest_logical);